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Updated: July 15, 2025
One of his last communications to the public, imparted with all the modesty and simplicity of true genius, at the last meeting of the British Association in Edinburgh, was on this subject of the exuviation of the crustacea.
These mutilations, however, are readily repaired; although, contrary to what was the common belief, the restoration takes place only at the next regular period of exuviation. This does not arise from confinement, which, according to Sir John, has no influence on colour. 'A young white specimen of the common crab was subjected to observation on 29th September.
This last shell of 12th September subsisted until 29th March, being 197 days, when it was thrown off during another exuviation. But what was remarkable, the animal now had only the two large claws, the other eight limbs were deficient. 'Resting on its breast as it was, I did not at first discover the fact, that the creature presented a strange and very uncouth aspect.
My solicitude was not vain. After the defective shell had subsisted eighty-six days, its tenant meantime feeding readily, the desired event took place in a new exuviation on 23d June. On this occasion a new animal came forth, and in the highest perfection, quite entire and symmetrical, with all the ten limbs peculiar to its race, and of the purest and most beautiful white.
That community of origin, growth, supremacy, and decadence which we have found among all kinds of government, suggests a community in modes of change also. On the other hand, Nature often performs substantially similar operations, in ways apparently different. Hence these details can never be foretold. Society, in all its developments, undergoes the process of exuviation.
In 102 days it underwent exuviation, when it appeared again, perfect as before, with a shell of snowy white, and a little red speckling on the limbs. Finally, its shell having subsisted 189 days, was succeeded by another of equal beauty and perfection, the speckling on the legs somewhat increased. As all the shells had gradually augmented, so was this larger than the others.
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